A: average marks of a class will be numbers like 80.0 or 60 or 35.55 or some floating point number. So it is floating point type.
B: name of season is a string i.e., set of characters (character datatype).
C: short sight spectacles power will be numbers like 2.0, 1.75 or some floating point number. So it is floating point type.
D: mega pixels of a mobile camera will be numbers like 2.0, 3.5 or some floating point number. So it is floating point type.